Production of printed circuit boards that meet the requirements of press-fit technology is extremely important for a good press-fit connection. The material and structure of a printed circuit board plated through hole has at least as high an influence on the quality of a press-fit connection as the press-fit zone itself. The DIN standard 41 611, part 5, "solder less electric connections - press in connections" covers the specifications for the structure of a printed circuit board. The IPC standard IPC-D-422 contain the design guide for Press Fit Rigid Printed Board Backplanes. The decisive characteristic of a high quality press in connection is not only a final diameter of the plated through hole withing the permissible tolerances, but also a correct hole structure. More about the PCB hole requirements for the press-fit technology (PCB hole HAL tin, PCB hole copper) you can find here (de/eng) and here (eng)